Tuesday, February 21, 2006

Spinning rings to churn out hydrogen

Hydrogen is often talked about as the clean energy of the future. But generating the stuff often still usually involves the use of polluting fuels. So, a non-polluting, solar-powered hydrogen generator under development at Sandia Labs in New Mexico, US, could be a big success.

The tongue-twistingly-named Counter Rotating Ring Receiver Reactor Recuperator (or CR5) will use large rings of iron oxide mixed and another metal oxide such as cobalt, magnesium or nickel, to extract hydrogen from steam, with the aid of sunlight.

The sun's rays will heat one side of the metal disks, powering a chemical reaction that draws hydrogen from the steam. And the cooler side will remove this oxygen, allowing the process to be repeated. The image above shows researcher Rich Diver working with a gigantic sun-collector at the lab (Image: Sandia).

Researchers from the Weizmann Institute in Israel are working on another solar-based hydrogen generator. They’ve built a 54-metre-tall tower that focuses sunlight to heat zinc oxide and wood charcoal to 1200 degrees centigrade, which generates condensed zinc powder. When mixed with water, this powder also produces hydrogen.

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